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intelligence (n.)

late 14c., "the highest faculty of the mind, capacity for comprehending general truths;" c. 1400, "faculty of understanding, comprehension," from Old French intelligence (12c.) and directly from Latin intelligentia, intellegentia "understanding, knowledge, power of discerning; art, skill, taste," from intelligentem (nominative intelligens) "discerning, appreciative," present participle of intelligere "to understand, comprehend, come to know," from assimilated form of inter "between" (see inter-) + legere "choose, pick out, read," from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')."

Meaning "superior understanding, sagacity, quality of being intelligent" is from early 15c. Sense of "information received or imparted, news" first recorded mid-15c., especially "secret information from spies" (1580s). Meaning "a being endowed with understanding or intelligence" is late 14c. Intelligence quotient first recorded 1921 (see I.Q.).

Origin and meaning of intelligence

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Definitions of intelligence from WordNet

intelligence (n.)
the ability to comprehend; to understand and profit from experience;
intelligence (n.)
a unit responsible for gathering and interpreting information about an enemy;
Synonyms: intelligence service / intelligence agency
intelligence (n.)
secret information about an enemy (or potential enemy);
we sent out planes to gather intelligence on their radar coverage
Synonyms: intelligence information
intelligence (n.)
information about recent and important events;
Synonyms: news / tidings / word
intelligence (n.)
the operation of gathering information about an enemy;
Synonyms: intelligence activity / intelligence operation
From wordnet.princeton.edu